by joabel1971 » Thu Aug 21, 2025 7:16 am
In regards to wrapping patent 512,340 (interleaved coil) into a cone shape - the outcome isn't a cone antenna with 1 wirelength resonance. It's a condensed array of loop antennas - each having it's own wirelength resonance.
1. Due to the capacitance between the two wires - each wrap is isolated from the next - causing an array of loop antennas covering a wide band of resonant wavelengths.
2. Also, by setting the cone base circumference equal to the slant height - you get a constant base angle, irregardless of the height.
That also means that all wavelengths streaming from each loop antenna will meet at a common point (apex) of the cone shape. So, by putting a near-field sensor at that point - you will potentially get resonant signals. SDRs, VNAs, and Spectrum analayzers are very good at sorting through a wide band of frequencies - and SDRs can be programed to combine "like" frequencies.
3. I figured out a few years ago - that series of 1/2, 1/4, 1/8, 1/16-wave, etc. - began to constructively interfere at a phase of 3/2*pi.
SDRs can add that phase to any of their IQ data.
4. So, do you want an easy way to build a fractal antenna - without bending snowflake figures? Start with Patent 512,340, wrap it on a cone with slant height = base circumference, and realize that it is a series of loop antennas with individual resonant frequencies. My HamGeek B220mini is really useful for this work, and A.I. seems to be good at writing python scripts for it.
Picture 76.jpg
Picture 86.jpg
In regards to wrapping patent 512,340 (interleaved coil) into a cone shape - the outcome isn't a cone antenna with 1 wirelength resonance. It's a condensed array of loop antennas - each having it's own wirelength resonance.
1. Due to the capacitance between the two wires - each wrap is isolated from the next - causing an array of loop antennas covering a wide band of resonant wavelengths.
2. Also, by setting the cone base circumference equal to the slant height - you get a constant base angle, irregardless of the height.
That also means that all wavelengths streaming from each loop antenna will meet at a common point (apex) of the cone shape. So, by putting a near-field sensor at that point - you will potentially get resonant signals. SDRs, VNAs, and Spectrum analayzers are very good at sorting through a wide band of frequencies - and SDRs can be programed to combine "like" frequencies.
3. I figured out a few years ago - that series of 1/2, 1/4, 1/8, 1/16-wave, etc. - began to constructively interfere at a phase of 3/2*pi.
SDRs can add that phase to any of their IQ data.
4. So, do you want an easy way to build a fractal antenna - without bending snowflake figures? Start with Patent 512,340, wrap it on a cone with slant height = base circumference, and realize that it is a series of loop antennas with individual resonant frequencies. My HamGeek B220mini is really useful for this work, and A.I. seems to be good at writing python scripts for it. [attachment=0]Picture 76.jpg[/attachment][attachment=1]Picture 86.jpg[/attachment]